• Johannes Weiner's avatar
    mm: filemap: move radix tree hole searching here · e7b563bb
    Johannes Weiner authored
    The radix tree hole searching code is only used for page cache, for
    example the readahead code trying to get a a picture of the area
    surrounding a fault.
    
    It sufficed to rely on the radix tree definition of holes, which is
    "empty tree slot".  But this is about to change, though, as shadow page
    descriptors will be stored in the page cache after the actual pages get
    evicted from memory.
    
    Move the functions over to mm/filemap.c and make them native page cache
    operations, where they can later be adapted to handle the new definition
    of "page cache hole".
    Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
    Reviewed-by: default avatarRik van Riel <riel@redhat.com>
    Reviewed-by: default avatarMinchan Kim <minchan@kernel.org>
    Acked-by: default avatarMel Gorman <mgorman@suse.de>
    Cc: Andrea Arcangeli <aarcange@redhat.com>
    Cc: Bob Liu <bob.liu@oracle.com>
    Cc: Christoph Hellwig <hch@infradead.org>
    Cc: Dave Chinner <david@fromorbit.com>
    Cc: Greg Thelen <gthelen@google.com>
    Cc: Hugh Dickins <hughd@google.com>
    Cc: Jan Kara <jack@suse.cz>
    Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    Cc: Luigi Semenzato <semenzato@google.com>
    Cc: Metin Doslu <metin@citusdata.com>
    Cc: Michel Lespinasse <walken@google.com>
    Cc: Ozgun Erdogan <ozgun@citusdata.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Roman Gushchin <klamm@yandex-team.ru>
    Cc: Ryan Mallon <rmallon@gmail.com>
    Cc: Tejun Heo <tj@kernel.org>
    Cc: Vlastimil Babka <vbabka@suse.cz>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    e7b563bb
readahead.c 15.9 KB